Yarn End Catching Device Twist Applying Nozzle
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Solution Overview
Problem
Existing spinning machines face issues with yarn breakage and inefficient yarn splicing due to weak yarn strength and high air consumption during the yarn end catching process, particularly when omitting the delivery roller, which affects spinning quality and efficiency.
Innovation Solution
A yarn end catching device with a suction passage and a twist applying member that uses whirling airflow generated by compressed air to apply twists to the yarn, reducing breakage and air consumption, while ensuring stable yarn guidance and increased strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the delivery roller is omitted and the yarn accumulating device directly pulls the yarn, then the yarn can be pulled with more stable tension, but true-twist yarn cannot be produced and yarn strength decreases substantially
Solution Approach 1:
The yarn handling system is segmented into distinct functional zones: the yarn accumulating roller for tension control, the suction pipe for yarn end capture, and the twist applying member for twist insertion. This segmentation allows each component to perform its specialized function optimally, resolving the contradiction between stable tension and yarn strength.
Solution Approach 2:
The twist applying member applies twists to the yarn end before it is fully pulled by the yarn accumulating device. This preliminary action ensures that the yarn gains strength through twisting before undergoing the full pulling tension, thereby maintaining both tension stability and yarn strength.
2Reliability
If the suction pipe catches the yarn end using conventional suction, then the yarn end can be caught, but air consumption is substantial
Solution Approach 1:
The suction pipe utilizes pneumatic principles to create a controlled vacuum field that efficiently captures the yarn end. By optimizing the pneumatic system, the device achieves reliable yarn end catching with reduced air consumption compared to conventional suction methods.
Solution Approach 2:
The suction pipe employs parameter changes in the airflow characteristics, such as varying suction pressure and flow rate, to optimize the catching process. This allows the system to maintain high reliability in yarn end catching while minimizing overall air consumption through precise parameter control.
3Productivity
If the yarn is pulled by the yarn feeding device with rotation, then the yarn can be fed downstream, but the yarn can slip due to insufficient nipping force, causing decrease in spinning quality
Solution Approach 1:
The patent replaces the mechanical nipping and pulling system with a pneumatic-based system. The suction pipe uses airflow to capture and guide the yarn end, eliminating the need for mechanical nipping that causes slippage. This substitution maintains productivity while improving spinning quality through more reliable yarn control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively prevents yarn breakage and improves spinning machine efficiency by applying twists to weak yarns, reducing air consumption, and ensuring reliable yarn catching and splicing operations.
Implementation Method 1
a suction passage (62) that sucks the yarn end (10)
Implementation Method 2
a twist applying member (67) that applies twists to the yarn (10) sucked in the suction passage (62)... injects compressed air to form whirling airflow in the suction passage (62)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A spinning machine includes a suction pipe (44) for sucking and catching a yarn end of spun yarn 10 and for guiding the yarn end to a yarn splicing device. The suction pipe 44 includes a suction passage 62 for sucking the yarn end and a twist applying nozzle 67. The twist applying nozzle 67 injects compressed air to generate whirling airflow in the suction passage 62, and thus, the twist applying nozzle 67 can apply twists to the spun yarn 10 sucked in the suction passage 62 (Fig. 5).